# create a new list>>> a = [1,2,3,4,5]>>> a
[1, 2, 3, 4, 5]
# sample list comprehension expression; equivalent to b = a>>> b = [a[i] for i in range(len(a))]>>> b
[1, 2, 3, 4, 5]
# only even indices>>> b = [a[i] for i in range(len(a)) if i % 2 == 0]>>> b [1, 3, 5]
# only even indices and conditionally modifies the value of a[i]
>>> b = [a[i]*2 if i > 1 else a[i] for i in range(len(a)) if i % 2 == 0]
>>> b [1, 6, 10]
